Wrapping machine



W. IVI. WHEILDOII-I.

WRAPPING MACHINE.

APPLICATION FILED APR. i, 19I9. l

MM50@ Patented MIF. I4, w22,

2 SHEETS-SHEET I.

w m; WHEILDON.

WRAPFlNG MACHINE.

APPUCMION FILED APR. I, Haig. l

FSM-@med Mar. i4, 1922.

2 SHEETS-SHEET 2.

. moaaoa'.

OFFICE.

WILLIAM M. WHEILDON, or ASHLAND, MASSACHUSETTS, ASSIGNOE To EDWARD n. y ANGIEE, 0E EEAMINGHAM, MASSACHUSETTS.

WEArzP-ING MAGEINE.

. Application filed April 1,

Y To aZZ wznm t may concern.'

Be`it known that I, WILLIAM M. IVHEIL- DON, a citizen ofthe United States, .and a resident of'Ashland, `county of l\iddlesex,4

State of Massachusetts, Vhave invented an Improvement in Trapping Machines, ofv

which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. A

This invention relates to Wrapping machines of the type wherein a strip is wound by the motion .of a suitable shuttle round the article wrapped. Machines of this gen'- eral type are in commonuse for Wrapping pneumatic vehicle tires, and for convenience I shall refer Specifically to a tirewrapping machine. using the Word in an exemplary sense. The purpose of the' invention is to provide various improvements in thelconstruction ofssuch a machine which will' render it more eflicient, in action.

My invention Will4 best be understood by referenceto the following description of an illustrative embodiment of my ,invention as shownin the accompanying drawings Where- 1n:

Figure 1 is avview, partly in end elevation and partly in section, showing as much of a Wrapping machine as is necessary to an understanding of my invention; and

Figs. 2 and 3 are sections on the lines 2-2 and 3-3,`respectively, of Fig. `1 and are on an enlarged scale. i

Referring to Fig. 1 of the drawings, the machine shown is of a type not novel to this application vand embodies in its construction a .partially annular shuttle 'Which may be supported on rollers 7 and rotated in any desired manner,fas by means of the driving belt 9, engaging the Shuttle through! out an extended arc, and the driving wheel 11. The article to'be Wrapped, herein a tire, is supported on rolls 13, one vof which isshown in the drawing, Which'niay be re- Specication of Letters Patent. ,Patented Mai. 14; 1922.-

1919. se'rjiai x0'. 286,717.

the` shuttle in the form of a'roll 15. Herein I show a post or spindle 17 (see Fig. V2), mounted on the face of the shuttle, on Which is journalle'd a'sleeve 19 adapt-ed to'turn on the spindle 17 between the friction Washers 21 and 23, conveniently of oil-impregnated Wood, the former being clamped against vthe right hand end of the sleeve by washer 25 held by nut 27, and the latter by Washer 28 which is provided with a recess 29 in which the flat spring 31 fits, the spring 3-1 being` interposed between the Washer 28 and the face of the Shuttle Anadjusting screw 33 .acting -on one end ofthe springpermits a regulated friction tobe applied'to the end of the sleeve 19 to control its revolution about the Spindle 17. The interior bearing surface of the sleeve 19 on spindle 17 is also preferably of oil-impregnated wood, this being provided for herein bythe use of a bushing 34 of such material.

On the spindle-17 is mounted the core or spool 35 on which iS carried the roll of Strip 15.v The core 35 is interlocked with Athe sleeve 19 and prevented from rotating thereon, and for, this purpose the exterior surface ofthe sleever 19 and the inner bore of the co-re may be made 'of corresponding form.v non-circular in cross-section. As in'- dicated in Fig. 1, the exterior of the spindle and the interior of the core may be formed with one or more flattened sides and herein they are shown substantially hexagonal.l y

core may also be made non-circular and conveniently of the'same formas the 5 interio'r bore, as indicated by-the'dotted line in Fig. 1.

4To secure the Spool 35 on the 'sleeve 19, the

Alatter may have grooves 37 milled therein in :which are mounted spring latches 39 having shoulders adapted to latch'over the exterior 100 face of the spool. Thesev latches may be proy 4vided with extended ends, as shown, to permit them to be pressed. toward one another. To place the roll on the shuttle, it is only necessary to squeeze together-,the latches 39 1057A and thrust the spool over the sleeve 19, which it fits, and permit the latches to l to the position shown inl Fig. 2. plate 4:1

4at the back of the sleeve may provlde support for the roll on that side and a similar 1 ring out I -plate 43 may be sprung over the latches to.- gether with'the spool on lthe other side. By the Vconstruction just described, vthe only rotation which is permitted when the will be understood that the ordinary oiled.

bearing could not advantageously be used in a machine o f this type since it would tend to spatter oil which would injure the work. Furthermore, the bearing would soon become dry. The use of oil-impregnated wood provides' an easyrunning and durable bearing. Thejentire control of the rotation of th roll of strip is concentrated at the spindle. Heretofore it has been customary to apply a braking force to the strip itself, -but beside .certain other disadvantages the construction was mechanically complicated and rendered it comparatively difficult to place the rolls in position. In the present instance the-rolls are simply pushed on over the sleeve 19and then all parts move as a unit about the spindle 17 withoutthe necessity of any adjustment. Y

The use of jwashers 21 and 23 of a dense anti-heating material like oil-impregnated wood between the bearing surfaces on the ends of the hub and the bearing surfaces provided by the Washers 21 and 28 gives a double braking surface. In practice, for example, the rotation may take place between the inner washer 23 'and the washer 28 until the bearing becomes heated. It will then stick and rotation will then take place between the washer 21 and the washer 25 and so on in alternation.

The' wrapping strip leads from the main y supply thereof provided by the roll 15, preferably in the manner hereinafter to be de- 1 scribed, to the article wrapped, such aslthe tire T. In the present drawing I have shown it passing over an arc-shaped supporting surface 45, mounted on the shuttle, which vpositions the strip so that it wipes overa moistening roller 47 which may be utilized to supply suitable adhesive to the strip to provide a sealed package.

This construction, however, forms no part of the invention which is the subject of the present application. The vstrip leaves the shuttle, to be applied to the tire, overv a suitable guide which herein takes the form of a roller 49.

Since the tire T is irregular in form and the transverse to the plane of the shuttle and.

adapt itself to this variation. In the present instance this angular swinging is in the general direction of travel of the paper strip which passes over it. A To effect ad'ustment of the roll 49, as referred to, it'may, as best shown in Fig. 3,

To compensate be journalled in the arms 51 ofa. fork hav- -I ing a depending stem 53 which is swivelled substantially parallel to the face of the shuttle 5 in a post 55 projecting therefrom. It will be vclearly understood from Fig. 3v that as the stem 53 turns in the post 55, the anj gular position of the axis of the roll 49 may vary.

As has been pointed out, in the rotation "of the shuttle around the' tire the distance betweenthe guide roll 49 and the point of application of the strip to the tire varies markedly. Since the stripA is drawn from.

the roll by the wrapping action of thesame about the tire, the speed at which it travels varies. By way of illustration- I may state that I have found that in wrapping a 33 by 4*tire on such a machine as is illustrated, the average linear speed on each quarter of a revolution varied from 3%" to, 3 to 3%,to 22 and again to 31g. It vwill be clear that if the shuttle is run at a fair rate of speed, say 300 revolutions per minute, the tension on the paper is constantly varying, andv furthermore, the paper itself tends to lose tension through the action of centrifugal force thereon. I have found it impracticable to attempt to control the paper by friction or spring tension, as the paper is most likely either to snap at high rates of speed or to become so loose that the wrapping is not smoothly applied.

I have herein shown a tensioning element in the form of a roll 61 adapted to engage the inner side of the strip on its course from the roll 15 tothe guide roller 49, which roller 61 during the operation of the machine is under the control of centrifugal force andwhich has been found admirably to adapt itself .to keeping proper tension upon the wrapping strip. Referring to Fig.

2, the roller 61 is herein shown mounted on the end of an arm 63 Ypivoted on the face of the shuttle 5 and free to swing thereon. In the drawing I have illustrated a spring 65 extending substantially lengthwise of the arm 63 and securedto it and to a post 67 on the shuttle. This spring, however, may

bea light one and its function isvmerely to 13.0

position the arm when no wrapping stripwithout substantial tension thereon when the shuttle is at rest. ,A -V

lVhile the tension roller 61 may be utiit as shown in Fig. l in such manner that the strip may bedrawn about it to form a loop which returns against the side of the roll 15 and engages the same throughout an ex` tended arc, the whole presenting an appearance similar to a belt trained about a large and a small pulley, the roll 15 corresponding to the large pulley 'and thel roller' 6l to the small. The strip 15 may' be then led to. the

guide roller L19 and tothe tire at the oppo;4 site side of the roll 15 from that occupied-by the roller 6 1. This arrangement of strip provides for an vautomatic control of the rol-lV of strip 13, since if under the action of centrifugal force the'outer turns of the roll tend to belly oi' the roll to turn at a gieaterspeed than is required by the draft thereon, the run of the strip which forms one side of the loop referred to `will act on the roll in the manner cfa band brake;. Furthermore, if

the roll tends to move-too slowly,.the strip will act upon the same somewhat in the manner of a driving belt, so that the roll has a rotating` force applied to it at the right hand side in Fig. 1, as well as to the left hand side bythe draft of the paper.

As the shuttle rotates the roller 61 is nor mally positioned by the strip, as shown in F ig. 1,' but tends to swing outwardlyunder the action of centrifugal force. As the tension on the strip varies andas it tends to slacken or suddenly ltighten under the varying demands of draft thereon, tl'ie rollers 61- swings outwardly oi" inwardly, as the case may be, and while the operation of the Amaso that it is drawn smoothly and -tightly about the article to' be wra ped and at the same time is not subjectedJ to a breaking strain Whichl might snap the saine.v

I have described in detail the illustrative' applicable to the wrapping of articles of ir'- regular section, in combination with atrotating shuttle, a strip .supply and tensionmaintaining means comprising an element .membe'r, moving, during the rotation of the shuttle, through a path of constantly chang-l the guide, said member being; mountedfto during the rotation of the shuttle,

moving, a path of constantly 4changing dithrong rection, said elementbeing arranged to engage the inner side'of the strip between 'the supply thereofand its point of' application 70 tothe article wrapped and adapted normally to be positioned bythe strip-without j substantial tension, said element lbeing mounted to'permit free movement'thereof controlled conjointly by centrifugal. .force land the v1tension ofthe strip during continuedv l 4operation of the machine. lized iii various positions, I prefer to place regular section, in combination with a rotary v shuttle, a support for a roll of- Wrapping ma' trial, aguideoverwhich the material is led v to the article wrapped, and tensionmaintaining means comprising a normally unten'sioned ing direction, said element being arranged to engage and be positioned by the material on its course from the roll onthe support to permit free' movement thereof controlled -conjointly by centrifugal force-and the tension of the strip during continued operation of themachinef.

y 3. In amaohine ofthe class described, in

Acombination with a rotary. shuttle', a support for a roll-of wrapping material, a guide over which the material is` led to the article wrapped, and an .arm freely swingable in the plane'of the shuttle during operation-of 100 the machine havin a terminal portion for engaging the material on its course from the roll on. the` support to the guide and carried, during the rrotationof the shuttle, through a path of constantly changing direction.

10il 4. In a machine of the class described, in

combination, a .revolvable shuttle, va'roll of strip material rotatably mounted on v.the shuttle', a swinging arm having a roll thereon, and a guide over which the strip is led y frc m .the shuttle to thearticle wrapped, said parts being so located relatively as to,

l .provide a loop arpund the roll' on-the arm, a chine continues it keeps the strip tensioned .ment With'a core,-end bearii1gs forlthe' sleeve and adjustable braking meansinterposed between thelshuttle and one of 'said bearings, to exert. anendwisebraking pressure on the latten` 6. In-a machineof theclass described, incombinationwith, al rotary shuttle, a spindle projectin therefrom', :ir-sleeve rotatablefon.

the spin le vhaving an' exteriorsurface formed forinterlocking' engagement with a im core, end bea-rings Jfor the sleeve and a dense anti-heating material engaging said spring inteiposed between one of said beaisurfaces, Washers engaging said members 10 ings and the shuttle. and means to apply a braking pressure to 7. In a machine of the class described a one such Washer.

i 5 spindle, a roll-*carrying hub rotataby mount- In testimony whereof, I have signed my ed thereon having provision for holding the name to thisvspecieation.

roll to rotate therewith and having end bearl ing surfaces, rotary members of smooth WILLIAM M. WHEILDON. 

